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diff --git a/zto/node/Peer.cpp b/zto/node/Peer.cpp
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+/*
+ * ZeroTier One - Network Virtualization Everywhere
+ * Copyright (C) 2011-2016 ZeroTier, Inc. https://www.zerotier.com/
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "../version.h"
+
+#include "Constants.hpp"
+#include "Peer.hpp"
+#include "Node.hpp"
+#include "Switch.hpp"
+#include "Network.hpp"
+#include "SelfAwareness.hpp"
+#include "Cluster.hpp"
+#include "Packet.hpp"
+
+#ifndef AF_MAX
+#if AF_INET > AF_INET6
+#define AF_MAX AF_INET
+#else
+#define AF_MAX AF_INET6
+#endif
+#endif
+
+namespace ZeroTier {
+
+Peer::Peer(const RuntimeEnvironment *renv,const Identity &myIdentity,const Identity &peerIdentity) :
+ RR(renv),
+ _lastReceive(0),
+ _lastNontrivialReceive(0),
+ _lastTriedMemorizedPath(0),
+ _lastDirectPathPushSent(0),
+ _lastDirectPathPushReceive(0),
+ _lastCredentialRequestSent(0),
+ _lastWhoisRequestReceived(0),
+ _lastEchoRequestReceived(0),
+ _lastComRequestReceived(0),
+ _lastComRequestSent(0),
+ _lastCredentialsReceived(0),
+ _lastTrustEstablishedPacketReceived(0),
+ _remoteClusterOptimal4(0),
+ _vProto(0),
+ _vMajor(0),
+ _vMinor(0),
+ _vRevision(0),
+ _id(peerIdentity),
+ _numPaths(0),
+ _latency(0),
+ _directPathPushCutoffCount(0),
+ _credentialsCutoffCount(0)
+{
+ memset(_remoteClusterOptimal6,0,sizeof(_remoteClusterOptimal6));
+ if (!myIdentity.agree(peerIdentity,_key,ZT_PEER_SECRET_KEY_LENGTH))
+ throw std::runtime_error("new peer identity key agreement failed");
+}
+
+void Peer::received(
+ const SharedPtr<Path> &path,
+ const unsigned int hops,
+ const uint64_t packetId,
+ const Packet::Verb verb,
+ const uint64_t inRePacketId,
+ const Packet::Verb inReVerb,
+ const bool trustEstablished)
+{
+ const uint64_t now = RR->node->now();
+
+#ifdef ZT_ENABLE_CLUSTER
+ bool suboptimalPath = false;
+ if ((RR->cluster)&&(hops == 0)) {
+ // Note: findBetterEndpoint() is first since we still want to check
+ // for a better endpoint even if we don't actually send a redirect.
+ InetAddress redirectTo;
+ if ( (verb != Packet::VERB_OK) && (verb != Packet::VERB_ERROR) && (verb != Packet::VERB_RENDEZVOUS) && (verb != Packet::VERB_PUSH_DIRECT_PATHS) && (RR->cluster->findBetterEndpoint(redirectTo,_id.address(),path->address(),false)) ) {
+ if (_vProto >= 5) {
+ // For newer peers we can send a more idiomatic verb: PUSH_DIRECT_PATHS.
+ Packet outp(_id.address(),RR->identity.address(),Packet::VERB_PUSH_DIRECT_PATHS);
+ outp.append((uint16_t)1); // count == 1
+ outp.append((uint8_t)ZT_PUSH_DIRECT_PATHS_FLAG_CLUSTER_REDIRECT); // flags: cluster redirect
+ outp.append((uint16_t)0); // no extensions
+ if (redirectTo.ss_family == AF_INET) {
+ outp.append((uint8_t)4);
+ outp.append((uint8_t)6);
+ outp.append(redirectTo.rawIpData(),4);
+ } else {
+ outp.append((uint8_t)6);
+ outp.append((uint8_t)18);
+ outp.append(redirectTo.rawIpData(),16);
+ }
+ outp.append((uint16_t)redirectTo.port());
+ outp.armor(_key,true,path->nextOutgoingCounter());
+ path->send(RR,outp.data(),outp.size(),now);
+ } else {
+ // For older peers we use RENDEZVOUS to coax them into contacting us elsewhere.
+ Packet outp(_id.address(),RR->identity.address(),Packet::VERB_RENDEZVOUS);
+ outp.append((uint8_t)0); // no flags
+ RR->identity.address().appendTo(outp);
+ outp.append((uint16_t)redirectTo.port());
+ if (redirectTo.ss_family == AF_INET) {
+ outp.append((uint8_t)4);
+ outp.append(redirectTo.rawIpData(),4);
+ } else {
+ outp.append((uint8_t)16);
+ outp.append(redirectTo.rawIpData(),16);
+ }
+ outp.armor(_key,true,path->nextOutgoingCounter());
+ path->send(RR,outp.data(),outp.size(),now);
+ }
+ suboptimalPath = true;
+ }
+ }
+#endif
+
+ _lastReceive = now;
+ switch (verb) {
+ case Packet::VERB_FRAME:
+ case Packet::VERB_EXT_FRAME:
+ case Packet::VERB_NETWORK_CONFIG_REQUEST:
+ case Packet::VERB_NETWORK_CONFIG:
+ case Packet::VERB_MULTICAST_FRAME:
+ _lastNontrivialReceive = now;
+ break;
+ default: break;
+ }
+
+ if (trustEstablished) {
+ _lastTrustEstablishedPacketReceived = now;
+ path->trustedPacketReceived(now);
+ }
+
+ if (_vProto >= 9)
+ path->updateLinkQuality((unsigned int)(packetId & 7));
+
+ if (hops == 0) {
+ bool pathIsConfirmed = false;
+ {
+ Mutex::Lock _l(_paths_m);
+ for(unsigned int p=0;p<_numPaths;++p) {
+ if (_paths[p].path->address() == path->address()) {
+ _paths[p].lastReceive = now;
+ _paths[p].path = path; // local address may have changed!
+#ifdef ZT_ENABLE_CLUSTER
+ _paths[p].localClusterSuboptimal = suboptimalPath;
+#endif
+ pathIsConfirmed = true;
+ break;
+ }
+ }
+ }
+
+ if ( (!pathIsConfirmed) && (RR->node->shouldUsePathForZeroTierTraffic(_id.address(),path->localAddress(),path->address())) ) {
+ if (verb == Packet::VERB_OK) {
+ Mutex::Lock _l(_paths_m);
+
+ // Since this is a new path, figure out where to put it (possibly replacing an old/dead one)
+ unsigned int slot;
+ if (_numPaths < ZT_MAX_PEER_NETWORK_PATHS) {
+ slot = _numPaths++;
+ } else {
+ // First try to replace the worst within the same address family, if possible
+ int worstSlot = -1;
+ uint64_t worstScore = 0xffffffffffffffffULL;
+ for(unsigned int p=0;p<_numPaths;++p) {
+ if (_paths[p].path->address().ss_family == path->address().ss_family) {
+ const uint64_t s = _pathScore(p,now);
+ if (s < worstScore) {
+ worstScore = s;
+ worstSlot = (int)p;
+ }
+ }
+ }
+ if (worstSlot >= 0) {
+ slot = (unsigned int)worstSlot;
+ } else {
+ // If we can't find one with the same family, replace the worst of any family
+ slot = ZT_MAX_PEER_NETWORK_PATHS - 1;
+ for(unsigned int p=0;p<_numPaths;++p) {
+ const uint64_t s = _pathScore(p,now);
+ if (s < worstScore) {
+ worstScore = s;
+ slot = p;
+ }
+ }
+ }
+ }
+
+ _paths[slot].lastReceive = now;
+ _paths[slot].path = path;
+#ifdef ZT_ENABLE_CLUSTER
+ _paths[slot].localClusterSuboptimal = suboptimalPath;
+ if (RR->cluster)
+ RR->cluster->broadcastHavePeer(_id);
+#endif
+ } else {
+ TRACE("got %s via unknown path %s(%s), confirming...",Packet::verbString(verb),_id.address().toString().c_str(),path->address().toString().c_str());
+ attemptToContactAt(path->localAddress(),path->address(),now,true,path->nextOutgoingCounter());
+ path->sent(now);
+ }
+ }
+ } else if (this->trustEstablished(now)) {
+ // Send PUSH_DIRECT_PATHS if hops>0 (relayed) and we have a trust relationship (common network membership)
+#ifdef ZT_ENABLE_CLUSTER
+ // Cluster mode disables normal PUSH_DIRECT_PATHS in favor of cluster-based peer redirection
+ const bool haveCluster = (RR->cluster);
+#else
+ const bool haveCluster = false;
+#endif
+ if ( ((now - _lastDirectPathPushSent) >= ZT_DIRECT_PATH_PUSH_INTERVAL) && (!haveCluster) ) {
+ _lastDirectPathPushSent = now;
+
+ std::vector<InetAddress> pathsToPush;
+
+ std::vector<InetAddress> dps(RR->node->directPaths());
+ for(std::vector<InetAddress>::const_iterator i(dps.begin());i!=dps.end();++i)
+ pathsToPush.push_back(*i);
+
+ std::vector<InetAddress> sym(RR->sa->getSymmetricNatPredictions());
+ for(unsigned long i=0,added=0;i<sym.size();++i) {
+ InetAddress tmp(sym[(unsigned long)RR->node->prng() % sym.size()]);
+ if (std::find(pathsToPush.begin(),pathsToPush.end(),tmp) == pathsToPush.end()) {
+ pathsToPush.push_back(tmp);
+ if (++added >= ZT_PUSH_DIRECT_PATHS_MAX_PER_SCOPE_AND_FAMILY)
+ break;
+ }
+ }
+
+ if (pathsToPush.size() > 0) {
+#ifdef ZT_TRACE
+ std::string ps;
+ for(std::vector<InetAddress>::const_iterator p(pathsToPush.begin());p!=pathsToPush.end();++p) {
+ if (ps.length() > 0)
+ ps.push_back(',');
+ ps.append(p->toString());
+ }
+ TRACE("pushing %u direct paths to %s: %s",(unsigned int)pathsToPush.size(),_id.address().toString().c_str(),ps.c_str());
+#endif
+
+ std::vector<InetAddress>::const_iterator p(pathsToPush.begin());
+ while (p != pathsToPush.end()) {
+ Packet outp(_id.address(),RR->identity.address(),Packet::VERB_PUSH_DIRECT_PATHS);
+ outp.addSize(2); // leave room for count
+
+ unsigned int count = 0;
+ while ((p != pathsToPush.end())&&((outp.size() + 24) < 1200)) {
+ uint8_t addressType = 4;
+ switch(p->ss_family) {
+ case AF_INET:
+ break;
+ case AF_INET6:
+ addressType = 6;
+ break;
+ default: // we currently only push IP addresses
+ ++p;
+ continue;
+ }
+
+ outp.append((uint8_t)0); // no flags
+ outp.append((uint16_t)0); // no extensions
+ outp.append(addressType);
+ outp.append((uint8_t)((addressType == 4) ? 6 : 18));
+ outp.append(p->rawIpData(),((addressType == 4) ? 4 : 16));
+ outp.append((uint16_t)p->port());
+
+ ++count;
+ ++p;
+ }
+
+ if (count) {
+ outp.setAt(ZT_PACKET_IDX_PAYLOAD,(uint16_t)count);
+ outp.armor(_key,true,path->nextOutgoingCounter());
+ path->send(RR,outp.data(),outp.size(),now);
+ }
+ }
+ }
+ }
+ }
+}
+
+bool Peer::hasActivePathTo(uint64_t now,const InetAddress &addr) const
+{
+ Mutex::Lock _l(_paths_m);
+ for(unsigned int p=0;p<_numPaths;++p) {
+ if ( (_paths[p].path->address() == addr) && ((now - _paths[p].lastReceive) <= ZT_PEER_PATH_EXPIRATION) && (_paths[p].path->alive(now)) )
+ return true;
+ }
+ return false;
+}
+
+bool Peer::sendDirect(const void *data,unsigned int len,uint64_t now,bool forceEvenIfDead)
+{
+ Mutex::Lock _l(_paths_m);
+
+ int bestp = -1;
+ uint64_t best = 0ULL;
+ for(unsigned int p=0;p<_numPaths;++p) {
+ if ( ((now - _paths[p].lastReceive) <= ZT_PEER_PATH_EXPIRATION) && (_paths[p].path->alive(now)||(forceEvenIfDead)) ) {
+ const uint64_t s = _pathScore(p,now);
+ if (s >= best) {
+ best = s;
+ bestp = (int)p;
+ }
+ }
+ }
+
+ if (bestp >= 0) {
+ return _paths[bestp].path->send(RR,data,len,now);
+ } else {
+ return false;
+ }
+}
+
+SharedPtr<Path> Peer::getBestPath(uint64_t now,bool includeExpired)
+{
+ Mutex::Lock _l(_paths_m);
+
+ int bestp = -1;
+ uint64_t best = 0ULL;
+ for(unsigned int p=0;p<_numPaths;++p) {
+ if ( ((now - _paths[p].lastReceive) <= ZT_PEER_PATH_EXPIRATION) || (includeExpired) ) {
+ const uint64_t s = _pathScore(p,now);
+ if (s >= best) {
+ best = s;
+ bestp = (int)p;
+ }
+ }
+ }
+
+ if (bestp >= 0) {
+ return _paths[bestp].path;
+ } else {
+ return SharedPtr<Path>();
+ }
+}
+
+void Peer::sendHELLO(const InetAddress &localAddr,const InetAddress &atAddress,uint64_t now,unsigned int counter)
+{
+ Packet outp(_id.address(),RR->identity.address(),Packet::VERB_HELLO);
+
+ outp.append((unsigned char)ZT_PROTO_VERSION);
+ outp.append((unsigned char)ZEROTIER_ONE_VERSION_MAJOR);
+ outp.append((unsigned char)ZEROTIER_ONE_VERSION_MINOR);
+ outp.append((uint16_t)ZEROTIER_ONE_VERSION_REVISION);
+ outp.append(now);
+ RR->identity.serialize(outp,false);
+ atAddress.serialize(outp);
+
+ outp.append((uint64_t)RR->topology->planetWorldId());
+ outp.append((uint64_t)RR->topology->planetWorldTimestamp());
+
+ const unsigned int startCryptedPortionAt = outp.size();
+
+ std::vector<World> moons(RR->topology->moons());
+ std::vector<uint64_t> moonsWanted(RR->topology->moonsWanted());
+ outp.append((uint16_t)(moons.size() + moonsWanted.size()));
+ for(std::vector<World>::const_iterator m(moons.begin());m!=moons.end();++m) {
+ outp.append((uint8_t)m->type());
+ outp.append((uint64_t)m->id());
+ outp.append((uint64_t)m->timestamp());
+ }
+ for(std::vector<uint64_t>::const_iterator m(moonsWanted.begin());m!=moonsWanted.end();++m) {
+ outp.append((uint8_t)World::TYPE_MOON);
+ outp.append(*m);
+ outp.append((uint64_t)0);
+ }
+
+ const unsigned int corSizeAt = outp.size();
+ outp.addSize(2);
+ RR->topology->appendCertificateOfRepresentation(outp);
+ outp.setAt(corSizeAt,(uint16_t)(outp.size() - (corSizeAt + 2)));
+
+ outp.cryptField(_key,startCryptedPortionAt,outp.size() - startCryptedPortionAt);
+
+ RR->node->expectReplyTo(outp.packetId());
+
+ if (atAddress) {
+ outp.armor(_key,false,counter); // false == don't encrypt full payload, but add MAC
+ RR->node->putPacket(localAddr,atAddress,outp.data(),outp.size());
+ } else {
+ RR->sw->send(outp,false); // false == don't encrypt full payload, but add MAC
+ }
+}
+
+void Peer::attemptToContactAt(const InetAddress &localAddr,const InetAddress &atAddress,uint64_t now,bool sendFullHello,unsigned int counter)
+{
+ if ( (!sendFullHello) && (_vProto >= 5) && (!((_vMajor == 1)&&(_vMinor == 1)&&(_vRevision == 0))) ) {
+ Packet outp(_id.address(),RR->identity.address(),Packet::VERB_ECHO);
+ RR->node->expectReplyTo(outp.packetId());
+ outp.armor(_key,true,counter);
+ RR->node->putPacket(localAddr,atAddress,outp.data(),outp.size());
+ } else {
+ sendHELLO(localAddr,atAddress,now,counter);
+ }
+}
+
+void Peer::tryMemorizedPath(uint64_t now)
+{
+ if ((now - _lastTriedMemorizedPath) >= ZT_TRY_MEMORIZED_PATH_INTERVAL) {
+ _lastTriedMemorizedPath = now;
+ InetAddress mp;
+ if (RR->node->externalPathLookup(_id.address(),-1,mp))
+ attemptToContactAt(InetAddress(),mp,now,true,0);
+ }
+}
+
+bool Peer::doPingAndKeepalive(uint64_t now,int inetAddressFamily)
+{
+ Mutex::Lock _l(_paths_m);
+
+ int bestp = -1;
+ uint64_t best = 0ULL;
+ for(unsigned int p=0;p<_numPaths;++p) {
+ if ( ((now - _paths[p].lastReceive) <= ZT_PEER_PATH_EXPIRATION) && ((inetAddressFamily < 0)||((int)_paths[p].path->address().ss_family == inetAddressFamily)) ) {
+ const uint64_t s = _pathScore(p,now);
+ if (s >= best) {
+ best = s;
+ bestp = (int)p;
+ }
+ }
+ }
+
+ if (bestp >= 0) {
+ if ( ((now - _paths[bestp].lastReceive) >= ZT_PEER_PING_PERIOD) || (_paths[bestp].path->needsHeartbeat(now)) ) {
+ attemptToContactAt(_paths[bestp].path->localAddress(),_paths[bestp].path->address(),now,false,_paths[bestp].path->nextOutgoingCounter());
+ _paths[bestp].path->sent(now);
+ }
+ return true;
+ } else {
+ return false;
+ }
+}
+
+bool Peer::hasActiveDirectPath(uint64_t now) const
+{
+ Mutex::Lock _l(_paths_m);
+ for(unsigned int p=0;p<_numPaths;++p) {
+ if (((now - _paths[p].lastReceive) <= ZT_PEER_PATH_EXPIRATION)&&(_paths[p].path->alive(now)))
+ return true;
+ }
+ return false;
+}
+
+void Peer::resetWithinScope(InetAddress::IpScope scope,int inetAddressFamily,uint64_t now)
+{
+ Mutex::Lock _l(_paths_m);
+ for(unsigned int p=0;p<_numPaths;++p) {
+ if ( (_paths[p].path->address().ss_family == inetAddressFamily) && (_paths[p].path->address().ipScope() == scope) ) {
+ attemptToContactAt(_paths[p].path->localAddress(),_paths[p].path->address(),now,false,_paths[p].path->nextOutgoingCounter());
+ _paths[p].path->sent(now);
+ _paths[p].lastReceive = 0; // path will not be used unless it speaks again
+ }
+ }
+}
+
+void Peer::getRendezvousAddresses(uint64_t now,InetAddress &v4,InetAddress &v6) const
+{
+ Mutex::Lock _l(_paths_m);
+
+ int bestp4 = -1,bestp6 = -1;
+ uint64_t best4 = 0ULL,best6 = 0ULL;
+ for(unsigned int p=0;p<_numPaths;++p) {
+ if ( ((now - _paths[p].lastReceive) <= ZT_PEER_PATH_EXPIRATION) && (_paths[p].path->alive(now)) ) {
+ if (_paths[p].path->address().ss_family == AF_INET) {
+ const uint64_t s = _pathScore(p,now);
+ if (s >= best4) {
+ best4 = s;
+ bestp4 = (int)p;
+ }
+ } else if (_paths[p].path->address().ss_family == AF_INET6) {
+ const uint64_t s = _pathScore(p,now);
+ if (s >= best6) {
+ best6 = s;
+ bestp6 = (int)p;
+ }
+ }
+ }
+ }
+
+ if (bestp4 >= 0)
+ v4 = _paths[bestp4].path->address();
+ if (bestp6 >= 0)
+ v6 = _paths[bestp6].path->address();
+}
+
+} // namespace ZeroTier
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